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We have a number of reports of students submitting when they didn't intend to. If you go through a test, the final submit is in the same place with the same appearence as continue. Thus it's easy not to notice that it's the final page and you're about to submit.

The common request is for a confirmation screen, but that has its own dangers. I think putting the submit button in a different place, or a bright red background, or something to make it visually distinct, might be good enough.